ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
ELECTRICAL POWER SUPPLY CIRCUIT TEST - CONTINUED
Expected Results. Installing bypass eliminates problem.
If results are OK, symptoms disappear when bypass harness is installed. Also, symptoms return when
bypass harness is removed. Problem is in wiring that supplies power to ECM. Replace wiring harness that
supplies power to ECM (WP 0169 00 thru WP 0175 00).
If results are NOT OK, replace engine ECM. Remove all jumpers and reconnect all connectors. Recheck
system for active diagnostic codes (WP 0053 00). Verify repair eliminates problem.
ENGINE PRESSURE SENSOR OPEN OR SHORT CIRCUIT TEST
N OT E
· Perform this procedure when there is active fault for oil pressure sensor or boost sensor.
· Troubleshooting procedures for diagnostic codes of each pressure sensor are identical. Pressure sensors are
sensors that have three terminals. Pressure sensors are active sensors. Active sensors require supply voltage
from ECM. ECM connector J1/P1 terminal 26 supplies + 5V to terminal A of each sensor. ECM connector J1/
P1 terminal 34 is common connection for pressure sensors. Sensor common connection is shared between all
pressure sensors. Common line is connected to each sensor connector terminal B. Signal voltage from terminal
C of each sensor is supplied to appropriate terminal at ECM connector J1/P1.
· Use this procedure for these diagnostic codes:
a. 100-03 Engine Oil Pressure Sensor Open Circuit
b. 100-04 Engine Oil Pressure Sensor Short Circuit
c. 102-03 Boost Pressure Sensor Open Circuit
d. 102-04 Boost Pressure Sensor Short Circuit
· These diagnostic codes should not be active:
a. 262-03 5V Sensor dc Power Supply Short to +Batt
b. 262-04 5V Sensor dc Power Supply Short to Ground